Sawing-machine.



UNITED STATES PATENT OFFICE.

FRANK J. PAIILS, OF CHICAGO, ILLINOIS.

SAWlNGmNlACHINE.

SPECIFICATION forming part of Letters Patent No. 701,380, dated June 3,1902. Application led uglist'ZB, 1901. Serial No. 73,025. (No model.)

To all zbtom, t may concern,.-

Bet knownthat I, FRANK J; PAHLs, a citizen of the United States ofAmerica, residing at Chicago, in the county oi' Cook and State ofIllinois, have invented certain new and useful Improvements inSawing-Machines, of which the following is a specification.

My invention relates to certain improvements in sawing-machines forsawing down trees or sawing up logs into smaller blocks, the object ofthe inventionbeing to provide suitable guiding and tension devices forthe free end of the saw. In ordinary saws of this class the free endsag, which prevents the saw from cutting in a straight line, and therebyincreases the friction, making the operation much heavier than when thesaw is guided to make a clean cut.

It is the purpose of this invention to obviate these difficulties; andto such end my invention consists in certain novel characteristics, adescription of which will be found in the following specification anddefinitely pointed out in the claims.

The invention is illustrated by means of drawings furnished herewith, inwhich- Figure l is a plan view of a saw with my improvement appliedthereto. Fig. 2 is a perspective view of the guiding and tension devicealone. Fig. 3 is a detail vertical section taken in line 3 3 of Fig. l,and Fig. 4 is a similar section in line 4 4 of Fig.` l.

In the views, A represents a saw-blade, connected to an operating-leverB by a stem or shank O. The lever is pivoted upon a board I), which isclamped to the trees by hooks d. A pressure-bar df, gives tension uponthe saw upon one side of the tree to force the saw into the cut.

All of the parts thus far described make up a saw of this class; butwithout the use ot' my improved guiding device the free end would sagand but poor results would be obtained by its use.

Upon the end of the board I) is secured aV plate E, having a toothediiange c projecting from its side, and upon this toothed ilange rests asimilarly-toothedlblock F, the two being connected together bya bolt fand nut f By loosening the nut f' the block F can be turned and adjusted upon the ilange e. From thereof is allowed to pivoted upon theboard,`

said block projects an arm G, upon the free end of which is an elbow II,having in its upper end a tubular bearing 7L, upon which is rotativelymounted a T-shaped coupling I. In said T-coupling are threaded two pipesK K', forming a guide, in which slides a rod L, provided at itsextremities with the clamp M, adapted to be secured to the free end ofthe'saw and adapted to readily engage and disengage the said free end.This clamp maybe adjusted along the blade thereof to properly position asupporting-rod with respect to saws of greater or less length, and itmaybe readily released at any time from the saw-blade to permit theremoval of one saw and its replacement by another. The rod L isspring-pressed towardthe saw by a spring O, one end of which is securedupon a screw c', threaded in the T- coupling I, and the other end ofwhich is secured upon a handle p of an adjusting collar P, turning uponthe bearing 7L and formed in its lower face with clutch-teeth 19,engaging similar teeth h2 upon the elbow H. The T-coupling and elbow areconnected together by a pin h3, threaded in the stem t" of the T-coupling and bearing without the elbow a nut h4. By turning the handle pthe torsional pressure of the spring O maybe varied, and consequentlymore or less pressure upon the saw, as desired. Also by adjusting thearm G angularly upon the flange e the purchase of the rod L upon the sawmay be varied, as the parts may be moved toward or away from theposition in which a sort of toggle action is obtained by varying thedistance of the pivotal point from the saw.

A brace R may be used to support the end of the arxn G. As shown, oneend of this brace is Wrapped around the arm G, and the other is adaptedto be thrust into thebark of the tree. A

From the above it will be clearly seen that the tendency of the saw tosag at its free end is obviated and that it is properly guided to make aclean cut, which lightens the work of sawing to a great extent, therebynot only saving the saw from injury, but lessening the labor and careattendant upon saws of this class.

I claim as new and desire to secure by Letters Patent-- ICG 1. A guidefor the saw-blade of sawing-inachines,comprising substantially a rodadapted t0 be secured to the saw-blade, an arm pivoted to the frame ofthe sawing-machine and adjustable With respect thereto, and a guidepivoted upon said arm and adapted to guide the rod in the piane of thesaw-blade; substantialiy as described.

2. In a sawing-machine, a frame, a sawblade, means for reciprocating thesaw, a bearing upon the frame, a guide pivoted in said bearing, a rodclamped to the saw and sliding in said guide and a spring adapted toexert tension through the medium of said rod, upon the free end of saidsaW; substantially as described.

3. A device for guiding a saw-'blade and appiying tension thereto,comprising substantialiy a bearing, a guide pivoted upon the bearing, arod sliding in said guide and secured to the saw-blade, a springengaging the guide and a lever connected to the bearing and engagingsaid spring and adapted by its upon the arm and a spring connected tothe guide and to the bearing, the rotation of said lever in onedirection serving to increase the tension upon the guide; substantiallyas described.

In Witness whereof I have hereunto set my hand, at Chicago, in thecounty of Cook and State of Illinois, this 20th day of August, A. D.

FRANK J. PAHLS. Witnesses:

CHAs. O. SHERVEY, S. BLIss.

